Crumble the toast into small pieces with your hands. Rub the zest of the lemon. Squeeze the lemon.
Heat the butter in a pan. Fry the toast and onions until golden brown while turning. Add honey, 5 tablespoon lemon, parsley and dill. Season with salt, pepper and paprika. Remove from stove to cool.
Place the washed fish in a greased baking dish. Sprinkle with the lemon peel. Careful, the taste becomes intense. Salt the fish.
Beat the egg whites until stiff and stir into the bread mixture. Cover the fish completely with it. Bake in the oven for about 20 minutes.